std::isfinite

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Determines if the given floating point number arg has finite value i.e. it is normal, subnormal or zero, but not infinite or NAN.

arg - floating point value

nonzero value if arg has finite value, 0 otherwise

fpclassify (C++11)

categorizes the given floating point value
(function)

isinf (C++11)

checks if the given number is infinite
(function)

isnan (C++11)

checks if the given number is NaN
(function)

isnormal (C++11)

checks if the given number is normal
(function)